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a thin membrane, or inner or third eyelid, present in many animals, capable of being drawn across the eyeball, as for protection.
(in reptiles, birds, and some mammals) a thin fold of skin beneath the eyelid that can be drawn across the eye Also called third eyelid, haw
nictitating membrane
A transparent inner eyelid in birds, reptiles, amphibians, and some mammals that protects and moistens the eye without blocking vision.


Read Also:

  • Nictitation

    nictitation nic·ti·ta·tion (nĭk’tĭ-tā’shən) n. Winking.

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  • Nicwa

    National Indian Child Welfare Association

  • Nid


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